So I built my system using Danfoss BD50 and a thin plate evaporator based on instructions and parts
from rparts.com back in 2007, and using Kohlman's book as a guide. These systems have capillary tubes.
This is now the second time I had to service
it/recharge it. Seems that every 3 years I notice that my vertical ice trays are not frozen anymore. At that time i also notice that compressor
discharge is not hot/warm to the touch. I am glad i put suction and discharge valves on it so attaching a gauge/service set is quick and easy. It takes about half of a R134a can that you can get a wallmart etc. I guess i should try to chase the leak(s) but I am just wondering if any other Danfoss/thin plate evaporator based fridge owners have had similar behavior.
Very soon after adding refrigerant, you can feel compressor
output/discharge getting hot, and at the same time, frost spreading across more and more of the evaporator.
At the time of failure, valves were at around 100psi for high side and 1-2psi for low side. There was not alot of change in pressures after re-filling. Suction side went up to around 5-6psi. I left the gauges on for about a day after servicing just to see where the pressures end up. I put a glass moisture indicator and surprisingly its still green but it has some yellow in it, not that i would know what it should look like if it had moisture.
Could the fact that the boat has been winterized and fridge shut off for about 6 months every year since 2008 have something to do with it?